مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2630
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that The Prophet (ﷺ) forbade selling the offspring of the foetus in the womb (of camels).
Musnad Ahmad 2645Its isnad is saheeh]